A retreat-stop device of an oil cylinder and an oil cylinder

Abstract

The utility model provides a kind of retreat stop device and oil cylinder of oil cylinder, retreat stop device is used to limit oil cylinder retraction, retreat stop device includes: backing plate assembly, drive assembly and with motor transmission connection and the shaft that passes through retreat backing plate.The retreat stop device further includes first spring between retreat backing plate and shaft.The retreat backing plate is equipped with the through-hole for the shaft to pass through, and part edge of through-hole is equipped with arc slot;Shaft is equipped with the protruding block that can be embedded in arc slot;First spring is located in arc slot, and abuts with protruding block.The utility model provides a kind of stable operation, can drive retreat backing plate to dump in time.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic systems, and more specifically, to a cylinder anti-reverse device and a cylinder. Background Technology

[0002] Hydraulic cylinders, as crucial components of hydraulic systems, play a vital role in the operation and function of mechanical equipment. They are widely used in various equipment such as excavators, cranes, presses, machine tools, and construction machinery, as well as in industries such as power generation, construction, machinery manufacturing, mining, railway bridges, and shipbuilding. Hydraulic cylinders provide powerful force and precise control, enabling related equipment to efficiently complete various work tasks.

[0003] The hydraulic cylinder mainly consists of a cylinder body (cylinder barrel and cylinder head), piston, piston rod, sealing structure, and accessories such as oil ports, base, fixing screws, and shock absorption devices. The piston rod is connected to the machine body via an end cap, and the piston is connected to the piston rod. The hydraulic cylinder operates based on the principle of fluid pressure transmission. When fluid enters the cylinder, the piston is pushed out; when fluid is discharged, the piston retracts. This reciprocating movement of the piston converts fluid pressure into linear motion force.

[0004] When a hydraulic cylinder is in operation, blockages in the oil circuit, insufficient hydraulic oil, aging of the cylinder seals, overload, or oil leakage can all cause the cylinder to fail to provide the necessary pushing force and unexpectedly retract, thus affecting the normal and stable operation of the equipment. Therefore, it is essential to install a backstop device on the hydraulic cylinder to prevent unexpected retraction.

[0005] Existing hydraulic cylinder anti-reverse devices typically utilize the weight of anti-reverse pads to allow them to fall naturally as the piston extends. For example, Chinese utility model patent CN212479757U discloses a hydraulic cylinder anti-reverse device. This device has multiple anti-reverse pads on each of its left and right sides, positioned between the cylinder body and the support plate. When the piston rod extends, it causes the support plate to extend as well. When the gap between the cylinder body and the support plate exceeds the thickness of one anti-reverse pad, the two anti-reverse pads, originally standing vertically on either side of the piston rod, tilt 90° to each other horizontally under their own weight, thus blocking the gap formed by the cylinder body, the support plate, and the piston rod. As the piston rod moves further, when the gap between the cylinder body and the support plate exceeds the thickness of N anti-retraction pads, the N anti-retraction pads on each side of the piston rod, which were originally standing vertically, tilt 90° to the horizontal under their own weight, continuing to obstruct the gap formed by the cylinder body, support plate, and piston rod. Thus, the anti-retraction pads prevent the piston rod from suddenly retracting after it extends. When the cylinder has finished its work and the piston rod needs to retract to release pressure, a motor or wrench can be used to drive the shaft passing through the anti-retraction pads to rotate, causing the horizontally tilted anti-retraction pads to rotate back to their vertically upright position.

[0006] As a mechanical locking device that protects the hydraulic cylinder and prevents the piston rod from accidentally retracting, the stability of the hydraulic cylinder's operation has a significant impact on the cylinder's safety performance and service life. A technical problem with existing hydraulic cylinder anti-retraction devices is that their operational stability is not ideal, they are prone to jamming, and this leads to safety hazards during cylinder operation. Utility Model Content

[0007] The present invention addresses the problem of providing a backstop device that can operate stably.

[0008] To address the aforementioned problems, this utility model provides a hydraulic cylinder anti-retraction device. The anti-retraction device restricts the retraction of the hydraulic cylinder and includes: a pad assembly comprising a plurality of anti-retraction pads; a drive assembly comprising a motor and a rotating shaft connected to the motor and passing through the anti-retraction pads; and a first spring disposed between at least one anti-retraction pad and the rotating shaft, and compressed as the rotating shaft rotates to apply elastic force to the anti-retraction pads. The anti-retraction pads have through holes through which the rotating shaft passes, and a portion of the edge of the through hole has an arc-shaped groove. The rotating shaft has a protrusion capable of embedding into the arc-shaped groove. The first spring is disposed within the arc-shaped groove and abuts against the protrusion.

[0009] In the above technical solution, the pad assembly, the drive assembly, and the first spring are respectively arranged in pairs on opposite sides of the oil cylinder.

[0010] In the above technical solution, the size of the through hole is matched with the diameter of the rotating shaft.

[0011] In the above technical solution, the arc-shaped groove is formed on the outer periphery of the through hole.

[0012] In the above technical solution, the central angle of the arc groove ranges from 90° to 150°.

[0013] In the above technical solution, one end of the first spring abuts against the inner wall of the arc-shaped groove, and the other end of the first spring abuts against the protrusion provided in the arc-shaped groove.

[0014] This utility model also provides a hydraulic cylinder, which includes: a hydraulic cylinder body; a piston rod capable of extending and retracting relative to the hydraulic cylinder body; and a backstop device as described in any of the above technical solutions; wherein the backstop device is used to limit the retraction of the piston rod relative to the hydraulic cylinder body.

[0015] In the above technical solution, the hydraulic cylinder further includes: a connecting member for connecting the anti-reverse device to the piston rod; a pad support member for supporting the anti-reverse device; wherein the anti-reverse device further includes a wrench part sleeved with the rotating shaft; the pad support member is connected to the connecting member and forms an open space for accommodating the wrench part.

[0016] In the above technical solution, the pad support includes: a first connecting part, which is connected to a connector; a second connecting part, one end of which is connected to the first connecting part and the other end of which is connected to a support frame; and a support frame, which is used to support the anti-reverse device; wherein the first connecting part and the second connecting part together form a right-angle bent structure that serves as an open space.

[0017] In the above technical solution, the hydraulic cylinder also includes a support component, which includes: a support plate for supporting the anti-reverse device; a connecting plate formed into an arc-shaped plate that fits the hydraulic cylinder body and connects the support plate to the hydraulic cylinder body; and a reinforcing rib disposed between the support plate and the connecting plate.

[0018] Beneficial effects

[0019] In this invention, several anti-reverse pads in the pad assembly can tilt sequentially under their own weight, following the extension of the hydraulic cylinder piston rod, to stop the piston rod and limit its retraction. To prevent the anti-reverse pads from jamming during tilting and to ensure the pad assembly stably performs its mechanical locking function, the anti-reverse device of this invention is also equipped with a first spring. Since the first spring is located between the anti-reverse pad and the rotating shaft, it can accumulate elastic force during the rotation of the anti-reverse pad caused by the motor-driven rotating shaft. The first spring assists in driving the anti-reverse pad to tilt smoothly by releasing its accumulated elastic force. Thus, by incorporating the first spring, the tilting of the anti-reverse pad no longer depends solely on its own weight, but can tilt under the combined drive of its own weight and the elastic force of the first spring. Therefore, the anti-reverse device of this invention is more stable and effective, and it can adapt to various working conditions. Even when the hydraulic cylinder is not installed horizontally or tilts during use, it can still tilt smoothly following the extension of the piston rod, providing more effective protection for the hydraulic cylinder. Furthermore, in some cases, the extended piston rod may require an increased extension, necessitating the pad assembly to function as a secondary mechanical lock. However, when this secondary mechanical locking is in effect, the originally upright anti-reverse pad is prone to jamming and failing to tilt properly. The primary spring ensures the pad assembly stably performs its secondary mechanical locking function, protecting the hydraulic cylinder when the piston rod extension / retraction needs adjustment. Attached Figure Description

[0020] Figure 1 This is a top view of the initial state of the anti-reverse device according to an embodiment of the present invention;

[0021] Figure 2 This is a top view of the anti-reverse device in the extended state according to an embodiment of the present invention;

[0022] Figure 3 This is a top view of the anti-reverse device in its fully extended state according to an embodiment of the present invention;

[0023] Figure 4 This is a front view schematic diagram of the initial state of the anti-reverse device according to an embodiment of the present invention;

[0024] Figure 5 This is a front view schematic diagram of the anti-reverse device in the extended state according to an embodiment of the present utility model;

[0025] Figure 6 This is a front view schematic diagram of the anti-reverse device in the fully extended state according to an embodiment of the present utility model;

[0026] Figure 7 This is a schematic diagram of the component structure of the anti-reverse pad according to one embodiment of the present utility model;

[0027] Figure 8 This is a schematic diagram of the component structure of the rotating shaft according to an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram illustrating the fit between the anti-reverse pad and the rotating shaft in one embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] Cylinder body: 110; Piston rod: 120; Connector: 130; Pad support: 140; First connecting part: 141; Second connecting part: 142; Support frame: 143; Bolt: 150; Support member: 160; Support plate: 161; Connecting plate: 162; Reinforcing rib: 163; Pad assembly: 210; First anti-reverse pad: 211; Nth anti-reverse pad: 212; Through hole: 220; Arc groove: 230; Motor: 310; Rotating shaft: 320; Protrusion: 330; First spring: 340; Groove: 350; Tightening part: 390. Detailed Implementation

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] This invention provides a backstop device for a hydraulic cylinder. During operation, a hydraulic cylinder may fail to provide the necessary pushing force due to factors such as oil circuit blockage, insufficient hydraulic oil, aging cylinder seals, overload, or oil leakage, causing the piston rod to unexpectedly retract. Unexpected retraction of the piston rod can affect the normal operation of equipment. The backstop device of this invention is used to prevent the piston rod of the hydraulic cylinder from unexpectedly retracting or failing.

[0033] like Figure 1 As shown, in order to achieve the above-mentioned function, the anti-reverse device of this utility model includes: a pad assembly 210, which includes a plurality of anti-reverse pads; a drive assembly, which includes a motor 310 and a rotating shaft 320 that is connected to the motor 310 and passes through the anti-reverse pads.

[0034] Specifically, the anti-reverse device of this utility model needs to cooperate with a hydraulic cylinder, which includes a cylinder body 110 and a piston rod 120. The piston rod 120 provides power by extending and retracting relative to the cylinder body 110. The pad assembly 210 and the drive assembly are respectively arranged in pairs on opposite sides of the cylinder.

[0035] Since the pad assemblies 210 and the drive assembly on opposite sides of the hydraulic cylinder have the same structure and correspond in position, this utility model is based on... Figure 1 Taking the pad assembly 210 and the drive assembly on the left side as examples, their shape, function and working principle are explained.

[0036] like Figure 1 As shown, the pad assembly 210 includes a plurality of anti-reverse pads arranged along the extension and retraction direction of the piston rod 120. All anti-reverse pads are identical in shape and are stacked sequentially against each other. The number of anti-reverse pads in a set of pad assemblies 210 can be selected and adjusted by those skilled in the art according to the extension and retraction of the piston rod 120. The shape of the anti-reverse pads can be fan-shaped, rectangular, triangular, or any other shape, as long as it can stop the piston rod 120. Among these, fan-shaped anti-reverse pads have a lower center of gravity, which is more conducive to the anti-reverse pads tipping over smoothly under their own weight.

[0037] The function of the drive assembly is to drive the anti-reverse pads to rotate. The drive assembly includes a motor 310 and a rotating shaft 320. The motor 310 is located at the end of the pad assembly 210, and the rotating shaft 320 is fixedly connected to the output shaft of the motor 310, so that the motor 310 drives the rotating shaft 320 to rotate. The motor 310 can be coaxially arranged with the rotating shaft 320 and directly drive the rotating shaft 320 to rotate; alternatively, the motor 310 and the rotating shaft 320 can be non-coaxial, connected to each other via a transmission structure such as a gear and rack. The rotating shaft 320 is also arranged along the extension and retraction direction of the piston rod 120 and passes through several anti-reverse pads sequentially. Thus, under the drive of the motor 310, the rotating shaft 320 can drive the anti-reverse pads to rotate. Among them, the motor 310 and the rotating shaft 320 are mainly used to drive the anti-reverse pad from a horizontal tilting state to a vertical upright state. When necessary, the motor 310 and the rotating shaft 320 can also rotate to drive or cooperate with the anti-reverse pad to flip from a vertical upright state to a horizontal tilting state.

[0038] For example, the pad assembly 210 of this utility model is connected to the piston rod 120 via the connector 130. Therefore, during the extension of the piston rod 120, several anti-retraction pads in the pad assembly 210 can tilt sequentially under their own weight, following the extension of the piston rod 120, and enter the gap formed by the connector 130, the cylinder body 110, and the piston rod 120 to stop the piston rod 120 and limit its retraction. Before the piston rod 120 needs to retract normally, the drive motor 310 can be controlled to drive the rotating shaft 320 to rotate, so that the power of the motor 310 can drive the tilted anti-retraction pads to flip and stand up, thereby avoiding the retraction path of the piston rod 120.

[0039] Figures 1 to 3 The diagrams show, in turn, the structural schematics of the anti-reverse device of one embodiment of the present invention in the initial state, the partially extended state, and the fully extended state, viewed from above. Figures 4 to 6 The diagrams show the structure of the anti-reverse device of one embodiment of the present invention in the initial state, the partially extended state, and the fully extended state, viewed from the front.

[0040] like Figure 1 and Figure 4 As shown, in the initial state, the piston rod 120 has not yet extended, and all the anti-reverse pads in the pad assemblies 210 on both sides of the piston rod 120 remain vertically upright. As the piston rod 120 extends, a gap appears between the connector 130, the cylinder body 110, and the piston rod 120. When the width of the gap reaches the thickness of one anti-reverse pad, the pair of first anti-reverse pads 211 on opposite sides of the piston rod 120 tilt relative to each other in the horizontal direction under their own weight.

[0041] like Figure 2 and Figure 5 As shown, as the piston rod 120 extends to a certain length, the gap between the connector 130, the cylinder body 110, and the piston rod 120 increases. The first anti-retraction pad 211 to the (N-1)th anti-retraction pad in the pad assembly 210 on both sides of the piston rod 120 tilts relative to each other in the horizontal direction under its own weight, thereby preventing the piston rod 120 from accidentally retracting. The Nth anti-retraction pad 212 and the last anti-retraction pad remain in a longitudinally upright state.

[0042] like Figure 3 and Figure 6 As shown, as the piston rod 120 extends fully, all the anti-reverse pads in the pad assembly 210 on both sides of the piston rod 120 have tilted over.

[0043] Before the piston rod 120 needs to retract normally, it can be controlled Figure 3 The motor 310 on the left drives the left rotating shaft 320 to rotate counterclockwise and controls... Figure 3 The motor 310 on the right side drives the right-side rotating shaft 320 to rotate clockwise. Through the power of the motor 310, the anti-reverse pads on the left and right sides, which have already tilted, are flipped up together to avoid the retraction path of the piston rod 120.

[0044] It is understandable that the main function of the drive assembly is to rotate the anti-reverse pad from a horizontal tilting state to a vertical upright state. However, during the process of the anti-reverse pad changing from a vertical upright state to a horizontal tilting state, the motor 310 and the rotating shaft 320 also need to rotate accordingly to cooperate with the tilting process of the anti-reverse pad.

[0045] For example, in Figure 4 When the first anti-reverse pad 211 on the left side tilts horizontally, the motor 310 on the left side needs to be controlled synchronously to drive the left rotating shaft 320 to rotate clockwise, and the control should be synchronized. Figure 4 The motor 310 on the right side drives the rotating shaft 320 on the right side to rotate counterclockwise so that the first anti-reverse pad 211 can be tilted.

[0046] The above structure allows for control of the tilting and standing of the pad assembly 210, thereby enabling the anti-retraction device to prevent the piston rod 120 from retracting unexpectedly. However, a problem with the existing anti-retraction device is that its operational stability is not ideal, leading to safety hazards during cylinder operation.

[0047] Specifically, as mentioned above, the anti-reverse pads in the pad assembly 210 need to tip over under their own weight. Therefore, the anti-reverse devices in the prior art are only suitable for situations where the hydraulic cylinder is arranged horizontally. Only when the hydraulic cylinder is strictly arranged horizontally can the anti-reverse pads on both sides tip over naturally under their own weight. However, in actual working scenarios, the installation conditions of the hydraulic cylinder are complex and varied, often not able to be installed strictly horizontally, or tilting during use. Therefore, under non-horizontal installation conditions, the anti-reverse devices in the prior art will jam and fail to tip over normally, thus posing a safety hazard to the operation of the hydraulic cylinder.

[0048] To prevent the anti-reverse pads from jamming during tipping and to ensure that the pad assembly 210 stably performs its mechanical locking function, the anti-reverse device of this utility model is further provided with an elastic drive unit. The elastic drive unit is located between at least one anti-reverse pad and the rotating shaft 320. The elastic drive unit cooperates with the drive assembly to drive at least one anti-reverse pad to tip under the action of elastic force.

[0049] This invention can provide corresponding elastic driving parts for all anti-reverse pads, or only for some anti-reverse pads. Since the elastic driving part is located between the anti-reverse pad and the rotating shaft 320, it accumulates elastic force during the rotation of the anti-reverse pad by the motor 310 driving the rotating shaft 320. The elastic driving part then releases this accumulated elastic force to assist in smoothly tilting the anti-reverse pad.

[0050] Therefore, by incorporating an elastic drive unit, this invention ensures that the tilting of the anti-reverse pad no longer relies solely on its own weight, but rather on the combined force of its own weight and the elasticity of the drive unit. Consequently, this novel anti-reverse device is more stable and effective, and can adapt to various working conditions. Even when the hydraulic cylinder is not horizontally installed or tilts during use, it can smoothly follow the extension of the piston rod 120 and tilt, providing more effective protection for the hydraulic cylinder.

[0051] Furthermore, in some cases, the extended piston rod 120 may need to extend further, requiring the pad assembly 210 to function as a secondary mechanical lock. In other words, assuming three anti-reverse pads are already tilted on each side of the piston rod 120, as the extension of the piston rod 120 increases, three more anti-reverse pads on each side of the piston rod 120 need to tilt horizontally relative to each other. When performing the secondary mechanical locking function, the originally upright anti-reverse pads are prone to jamming and failing to tilt properly. The elastic drive unit allows the pad assembly 210 to stably perform the secondary mechanical locking function, protecting the hydraulic cylinder when the extension / retraction of the piston rod 120 needs adjustment.

[0052] It is understood that in the technical solution of this utility model, the pad assembly 210, the drive assembly, and the elastic drive part are respectively arranged in pairs on opposite sides of the oil cylinder so that the forces on both sides of the oil cylinder are consistent, thereby providing stable protection for the oil cylinder.

[0053] like Figure 9 As shown, in one example of the present invention, at least a portion of the elastic drive portion is formed as a first spring 340, which is compressed as the shaft 320 rotates to apply elastic force to the anti-reverse pad.

[0054] As described above, during the process of the anti-reverse pad changing from a longitudinally upright state to a horizontally tilted state, it is necessary to control the motor 310 to drive the rotating shaft 320 to rotate accordingly to coordinate with the tilting process of the anti-reverse pad. Since the elastic drive part formed as the first spring 340 is located between the anti-reverse pad and the rotating shaft 320, during the rotation of the rotating shaft 320, the first spring 340 between the anti-reverse pad that has not yet tilted and the rotating shaft 320 will be compressed and accumulate elastic force. When the anti-reverse pad that was not originally tilted is pulled out along with the piston rod 120, the accumulated elastic force will be released, and together with the weight of the anti-reverse pad, it will drive the anti-reverse pad to tilt, thereby ensuring that the anti-reverse pad can tilt smoothly even if the cylinder is not installed horizontally.

[0055] like Figures 7 to 9 As shown, in this embodiment, the anti-reverse pad is provided with a through hole 220 through which the rotating shaft 320 passes, and a portion of the edge of the through hole 220 is provided with an arc groove 230; the rotating shaft 320 is provided with a protrusion 330 that can be embedded in the arc groove 230; the first spring 340 is provided in the arc groove 230 and abuts against the protrusion 330.

[0056] Specifically, the through hole 220 is circular in shape, and its size is adapted to the diameter of the rotating shaft 320. An arc-shaped groove 230 is formed on the outer periphery of the through hole 220, with a central angle ranging from approximately 90° to 150°. The thickness of the arc-shaped groove 230 is adapted to the height of the protrusion 330. The protrusion 330 and the rotating shaft 320 can be manufactured integrally by cutting. The protrusion 330 extends along the axial direction of the rotating shaft 320. One end of the first spring 340 abuts against the inner wall of the arc-shaped groove 230, and the other end abuts against the protrusion 330 located within the arc-shaped groove 230. Both ends of the first spring 340 can contact but not be fixedly connected to the inner wall of the arc-shaped groove 230 and the protrusion 330, respectively; alternatively, both ends of the first spring 340 can be fixedly connected to the inner wall of the arc-shaped groove 230 and the protrusion 330, respectively.

[0057] It is understandable that, driven by the motor 310, the rotating shaft 320 rotates and compresses the first spring 340 within the arc-shaped groove 230, thereby causing the first spring 340 to accumulate elastic force and assisting the anti-reverse pad in tipping over. By creating an arc-shaped groove 230 at the edge of the through hole 220 of the anti-reverse pad and placing the first spring 340 within the arc-shaped groove 230 to abut against the protrusion 330 on the rotating shaft 320, the first spring 340 can be protected and limited through a simple structure, preventing it from coming out and ensuring its stable operation, thereby further ensuring the stable operation of the anti-reverse device.

[0058] like Figure 1 As shown, in another embodiment of this utility model, the hydraulic cylinder further includes: a connecting member 130 for connecting the anti-reverse device to the piston rod 120; and a pad support member 140 for supporting the anti-reverse device. The anti-reverse device further includes a wrench portion 390 sleeved with the rotating shaft 320. The pad support member 140 is connected to the connecting member 130 and forms an open space for accommodating the wrench portion 390. Preferably, the pad support member 140 and the connecting member 130 are connected by bolts 150.

[0059] The anti-reverse device is connected to the piston rod 120 via the connector 130, thus enabling it to move with the piston rod 120. When the anti-reverse pad is reset, it can be driven by the motor 310 or manually rotated by the wrench 390 to reset the anti-reverse pad. The wrench 390 is located within the open space formed by the pad support 140 and the connector 130, saving space and reducing the size of the hydraulic cylinder.

[0060] Preferably, the pad support member 140 includes: a first connecting part 141, which is connected to the connector 130; a second connecting part 142, one end of which is connected to the first connecting part 141 and the other end of which is connected to the support frame 143; and a support frame 143, which is used to support the anti-reverse device; wherein the first connecting part 141 and the second connecting part 142 together form a right-angle bent structure as an open space.

[0061] The right-angle bending structure formed by the first connecting part 141 and the second connecting part 142 serves as an open space to accommodate the wrench part 390, which makes it easier to install the anti-reverse device and to perform the wrench operation on the wrench part 390.

[0062] like Figure 4 As shown, optionally, the hydraulic cylinder of this utility model further includes a support member 160, which includes: a support plate 161 for supporting the anti-reverse device; a connecting plate 162 formed into an arc-shaped plate that fits the hydraulic cylinder body 110 and connects the support plate 161 to the hydraulic cylinder body 110; and a reinforcing rib 163 disposed between the support plate 161 and the connecting plate 162.

[0063] Specifically, the support plate 161 has a flat plate structure, and the connecting plate 162 is welded to the support plate 161. The connecting plate 162 is an arc-shaped plate and fits the outer periphery of the cylinder body 110 to ensure a stable connection between the support member 160 and the cylinder body 110. The reinforcing rib 163 provided between the support plate 161 and the connecting plate 162 can improve the strength of the support member 160 and provide stable support for the anti-retraction device.

[0064] Although the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A backstop device for a hydraulic cylinder, characterized in that, The anti-retraction device is used to limit the retraction of the hydraulic cylinder, and the anti-retraction device includes: A pad assembly (210) comprising a plurality of anti-reverse pads; A drive assembly, the drive assembly including a motor (310) and a rotating shaft (320) that is drively connected to the motor (310) and passes through the anti-reverse pad. A first spring (340) is disposed between any one or more of the anti-reverse pads and the rotating shaft (320), and is compressed as the rotating shaft (320) rotates to apply a spring force to the anti-reverse pad; The anti-reverse pad is provided with a through hole (220) through which the rotating shaft (320) passes, and a portion of the edge of the through hole (220) is provided with an arc groove (230); the rotating shaft (320) is provided with a protrusion (330) that can be embedded in the arc groove (230); the first spring (340) is provided in the arc groove (230) and abuts against the protrusion (330).

2. The anti-reverse device according to claim 1, characterized in that, The pad assembly (210), the drive assembly, and the first spring (340) are respectively arranged in pairs on opposite sides of the hydraulic cylinder.

3. The anti-reverse device according to claim 1, characterized in that, The size of the through hole (220) is adapted to the diameter of the rotating shaft (320).

4. The anti-reverse device according to claim 1, characterized in that, The arc-shaped groove (230) is formed on the outer periphery of the through hole (220).

5. The anti-reverse device according to claim 4, characterized in that, The central angle of the arc groove (230) ranges from 90° to 150°.

6. The anti-reverse device according to claim 1, characterized in that, One end of the first spring (340) abuts against the inner wall of the arc groove (230), and the other end of the first spring (340) abuts against the protrusion (330) provided in the arc groove (230).

7. A hydraulic cylinder, characterized in that, The hydraulic cylinder includes: Hydraulic cylinder body (110); A piston rod (120) is retractable relative to the cylinder body (110); The anti-reverse device as described in any one of claims 1 to 6; The anti-retraction device is used to limit the retraction of the piston rod (120) relative to the cylinder body (110).

8. The hydraulic cylinder according to claim 7, characterized in that, The hydraulic cylinder also includes: A connector (130) is used to connect the anti-reverse device to the piston rod (120); A pad support member (140) is used to support the anti-reverse device; The anti-reverse device further includes a wrench part (390) sleeved with the rotating shaft (320); the pad support member (140) is connected to the connector (130) and forms an open space for accommodating the wrench part (390).

9. The hydraulic cylinder according to claim 8, characterized in that, The pad support member (140) includes: A first connecting part (141) is connected to the connector (130); The second connecting part (142) has one end connected to the first connecting part (141) and the other end connected to the support frame (143); The support frame (143) is used to support the anti-reverse device; The first connecting part (141) and the second connecting part (142) together form a right-angle bent structure that serves as the open space.

10. The hydraulic cylinder according to any one of claims 7 to 9, characterized in that, The hydraulic cylinder further includes a support member (160), the support member (160) comprising: A support plate (161) is provided for supporting the anti-reverse device; A connecting plate (162) is formed as an arc-shaped plate that fits the cylinder body (110) and connects the support plate (161) to the cylinder body (110); a reinforcing rib (163) is provided between the support plate (161) and the connecting plate (162).

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